<?php
header("Content-type: text/html");


$history = $this->api->get_history();

$data = array();
foreach( $history as $h )
{
	$data[] = '[' . $h['date'] . '000, ' . $h['usage'] . ']';
}

?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
	<meta http-equiv="content-type" content="text/html; charset=utf-8">
	<title>Untitled</title>
	<script language="javascript" type="text/javascript" src="flot/jquery.js"></script>
	<script language="javascript" type="text/javascript" src="flot/jquery.flot.js"></script>
	<script language="javascript" type="text/javascript" src="flot/jquery.flot.selection.js"></script>
</head>
<body>
	<div id="placeholder" style="width:600px;height:300px;"></div>

	<p>Basic graph of usage history per day. Try zooming. The plot below shows an overview.</p>

	<div id="overview" style="margin-left:50px;margin-top:20px;width:400px;height:50px"></div>


<script id="source">
$(function () {
	var d = [<?= implode(', ', $data) ?>];

	// first correct the timestamps - they are recorded as the daily
	// midnights in UTC+0100, but Flot always displays dates in UTC
	// so we have to add one hour to hit the midnights in the plot
	for (var i = 0; i < d.length; ++i)
		d[i][0] += 60 * 60 * 1000;

	// helper for returning the weekends in a period
	function weekendAreas(axes) {
		var markings = [];
		var d = new Date(axes.xaxis.min);
		// go to the first Saturday
		d.setUTCDate(d.getUTCDate() - ((d.getUTCDay() + 1) % 7))
		d.setUTCSeconds(0);
		d.setUTCMinutes(0);
		d.setUTCHours(0);
		var i = d.getTime();
		do {
			// when we don't set yaxis, the rectangle automatically
			// extends to infinity upwards and downwards
			markings.push({ xaxis: { from: i, to: i + 2 * 24 * 60 * 60 * 1000 } });
			i += 7 * 24 * 60 * 60 * 1000;
		} while (i < axes.xaxis.max);
		
		return markings;
	}
	
	var options = {
		xaxis: { mode: "time" },
		selection: { mode: "x" },
		grid: { markings: weekendAreas }
	};
	
	var plot = $.plot($("#placeholder"), [d], options);
	
	var overview = $.plot($("#overview"), [d], {
		series: {
			lines: { show: true, lineWidth: 1 },
			shadowSize: 0
		},
		xaxis: { ticks: [], mode: "time" },
		yaxis: { ticks: [], min: 0, autoscaleMargin: 0.1 },
		selection: { mode: "x" }
	});

	// now connect the two
	
	$("#placeholder").bind("plotselected", function (event, ranges) {
		// do the zooming
		plot = $.plot($("#placeholder"), [d],
			$.extend(true, {}, options, {
				xaxis: { min: ranges.xaxis.from, max: ranges.xaxis.to }
			}));
		
		// don't fire event on the overview to prevent eternal loop
		overview.setSelection(ranges, true);
	});
	
	$("#overview").bind("plotselected", function (event, ranges) {
		plot.setSelection(ranges);
	});
});
</script>
</body>
</html>
